Design and control algorithm for structures equipped with active variable stiffness devices

Pnevmatikos, NG; Gantes, CJ

dc.contributor.author	Pnevmatikos, NG	en
dc.contributor.author	Gantes, CJ	en
dc.date.accessioned	2014-03-01T01:33:07Z
dc.date.available	2014-03-01T01:33:07Z
dc.date.issued	2010	en
dc.identifier.issn	1545-2255	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20327
dc.subject	Earthquake engineering	en
dc.subject	FFT	en
dc.subject	Resonance control	en
dc.subject	Seismic design	en
dc.subject	Structural control	en
dc.subject	Variable stiffness system	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Instruments & Instrumentation	en
dc.subject.other	Active variable stiffness	en
dc.subject.other	Control strategies	en
dc.subject.other	Controlled structures	en
dc.subject.other	Design and control	en
dc.subject.other	Design phase	en
dc.subject.other	Design procedure	en
dc.subject.other	Diagonal elements	en
dc.subject.other	Earthquake engineering	en
dc.subject.other	Frequency contents	en
dc.subject.other	Frequency windows	en
dc.subject.other	Non-resonances	en
dc.subject.other	Numerical example	en
dc.subject.other	Operational phase	en
dc.subject.other	Seismic action	en
dc.subject.other	Structural control	en
dc.subject.other	Variable stiffness	en
dc.subject.other	Civil engineering	en
dc.subject.other	Design	en
dc.subject.other	Earthquakes	en
dc.subject.other	Fast Fourier transforms	en
dc.subject.other	Seismic design	en
dc.subject.other	Stiffness	en
dc.subject.other	Structural dynamics	en
dc.subject.other	Algorithms	en
dc.title	Design and control algorithm for structures equipped with active variable stiffness devices	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/stc.334	en
heal.identifier.secondary	http://dx.doi.org/10.1002/stc.334	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The design of structures with diagonal braces equipped with active variable stiffness devices, which can activate or deactivate the braces, is investigated, and an algorithm for their control under seismic actions based on non-resonance theory is proposed. More specifically, a new approach for choosing the bracing stiffness based on the frequency content of a range of anticipated earthquake signals and a corresponding control algorithm based on the frequency content of the incoming earthquake signal are proposed. The control strategy consists of the design and the operational phase. In the design phase, the diagonal stiffness elements (braces) are designed, based on a proposed expression, which relates the frequencies of the structure when the diagonal elements participate, or not, to the stiffness, to the width of the important frequency window of the anticipated earthquake. In the operational phase the incoming signal is continuously measured on-line and its frequency content is recognized. Based on this frequency content the control algorithm takes an appropriate decision on activating or deactivating the stiffness devices. The design procedure and the effectiveness of the control algorithm are demonstrated by numerical examples. The simulation results indicate that significant reduction in the response of the controlled structure can be achieved. Copyright (C) 2009 John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	Structural Control and Health Monitoring	en
dc.identifier.doi	10.1002/stc.334	en
dc.identifier.isi	ISI:000282996000001	en
dc.identifier.volume	17	en
dc.identifier.issue	6	en
dc.identifier.spage	591	en
dc.identifier.epage	613	en